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Get 3 different mons with self destruct, make are they don't have sturdy, and just blow yourself up. That way you can lose in just 3 turns instead of slowly losing over the course of 10+ turns because the AI cheats.
Also, this strategy is great for the earlygame. You get 1bp for every loss and you can use low level mons, giving you early access to EV-enhancing items.